FS: Campaign Page + Individual Campaign Page

[skassam21]

• users can see all of their campaigns on a page like /campaigns
  • for the campaigns page, we do not need any searching functionality as of now
  • there is a simple button to add a new campaign
• they can click on a campaign and see an individual campaign (/campaigns/:campaignId)
  • it'll just show the list of steps
  • no need to handle creating steps (another ticket)